Percocet contains oxycodone, a Schedule II controlled substance. As an opioid, Percocet exposes users to the risks of addiction, abuse, and misuse [see DRUG ABUSE AND DEPENDENCE]. Although the risk of addiction in any individual is unknown, it can occur in patients appropriately prescribed Percocet.
Use a waterpik! It is a miracle for cleaning under the gumline and in between teeth. You'll actually smell that awful smell coming out, but do it 2x a day and it'll fix that kind of odor. Don't forget, it doesn't replace flossing. All pharmacies and walmart, etc sell them.
If there are holes back there too, then it is time to worry. njtt. I have noticed a cheesy smell behind my ears as well although I don't think it is Swiss. There are a few parts of the body that start to smell like cheese after a few days of not bathing. The technical term for a body cheese smell is called Fumunacheese or at least that is what we called it when I was younger.